Write docs/advanced

[michaelsena]

• Advanced:
  - index.md
  - Standards:
  - docs/advanced/standards/index.md
  - Stream program standards:
  - docs/advanced/standards/stream-programs/index.md
  - CIP-3 JSON Storage (TileDocument): index.md
  - CIP-17 Crypto Account Links (CAIP10Link): index.md
  - Application standards:
  - docs/advanced/standards/application-protocols/index.md
  - CIP-11 Account-based indexing (IDX): docs/advanced/standards/application-protocols/cip-11-account-based-stream- indexing.md
  - Data model standards:
  - docs/advanced/standards/data-models/index.md
  - Data model universe: index.md
  - Data model examples and patterns: index.md
  - Account standards:
  - CIP-4 3ID DID: authentication/3id-did/method.md
  - PKH DID: index.md
  - Key DID: authentication/key-did/method.md
  - CIP-40 NFT DID: authentication/nft-did/method.md
  - CIP-50 Safe DID: authentication/safe-did/method.md
  - Indexing: docs/advanced/indexing.md
  - Storage and backup: docs/advanced/storage-and-backup.md
  - Privacy and access control: docs/advanced/privacy-and-access-control.md

[decentralgabe]

@michaelsena to break into a few stories